Improvement in doors for furnaces



of Pittsburg, in the county of Allegheny Stoves 'and Furnaces;and I do hereby de- Fig. 2 is a sectional view of the same; and

naces and stoves in whioh the grate-ba-rs'f tl1e the door.

draft from entering at-the sides of the doors CHARLES F. DEGELMAN, on PITTSBURG, PENNSYLVANIA.

lMPR-OVEMENT IN DOORS FOR FURNACES- Specification formin g part of Letters Patent N.

176,741, dated May 2, 1876; application filed February 26, 1576.

10 all whom t mag; concern:

Be it known that I, CHARLES F. DEGELMAN,

and State of Pennsylvania, have invented a new and useful Improvement in Doors for clare the following to be a full, clear, and ex act description thereof, reference being had to the accompanying drawing forming part of this speoification, in which- Figure 1 is a face view of my improved furnace and stove door, one door being open.

Fig. 3 is a detached perspective view of one of the doors.

Like letters of reference indicate like parts in each.

My invention relates to the doors of furfurnace approacl1 tl1e level of the bottom of Hitherto, in doors of this class, the draft through the furnace has been over the top of the fire, thus cutting off the flame, and not generating so much heat as if the draft passed through the fuel. And, also,-the ignited fuelrested drectly aganst the liners of the furnace-door, and on account of the intense heat. burned thern out very soon, the ordina-ry liners not lasting more than six weeks.

My invention has for its object the 1en1edying of these objections; and it consists, fi rst in causing the lovver portion of thedoor or doors to project or loend in so as to form an induot, which heats the air and induces a current through the uel on the front of the bars, ar1d likewise forms an air-'chamber which pro teots the lower portion of the liners; second, in closing the sides of the induot, 'ormed by the curved doors, by means of triangular or sutable shaped plates, wl1iol1 prevent the end. passing over the fuel, instead of through the same.

T0 enable otl1ers skilled in the art to make and use my invention I will describe its construction and manner of use.

In the drawing, B is thedoor-frame provided -with the base-plate D and liners G, the base-plate and liners being in one piece. The base-plate D is preferably inelined, as shown in Fig. 2, though the same may be horizontal.

Hinged a-t v are the doors A, which close against the door-frame B in the usual manner.

The 1ower portions of the doors A are curved or bent at 0b in towaird the furnace, until they are even or nearly even With the inner edge of the liners of the door-frame, and the triangular plates e are set in at the sides, so as to fit against the lners and prevent any fuel frorn coming a-gainst them, and also 1:0 direct the draft to the air-opening f. 'lhe lower hinges of the doors A extend onto and are attachd to the triangular plates 6. The bottoms of the doors A just clear the lower part of the door-frame B, so as to form the airinlet or drat-opeingfi The advantages of my improved door are, that on account of the inclnatin of the doors A and base-plate D, the current of air is directed. through the opening f downwardly, so as to rise through the fire, thus causing a more complete combustion of the fuel, and consequently a generationof more heat. That the inwardly-inolined doors prevent the ignited fue1 from restng upon the lners of the furnace-doors and burning them away. The airchamloer, through which the draft is constantly passing, materially aids in cooling and preserving the liners. The triangular pieces, which are preferably flanged so as to form an overlap on the frame, like the door, prevent the entrance of air at the sides of the door.

I have found that, with a door ofthis con struction, artificial draft may be dispensed with, and

the natural draft relied on to support combustien, and that in eiti1er stoves or furnaces, of the class specified, the fires may be readily controlled.

What I claim as myinvention, and desire 'co secure by Letters Patent, is

1. In a boiler or similar furnace, wherein the gratie-bars of the furnace approach the level of the bottom of the door, a door bent or curved inward at the Ioottomsubstantially as described, soas to cause the draft to pass .through the fuel, as and for the purpose spec- 2. In a boiler or srnilar furnace, wherein the gratebars of the furnace approach the level otthe botton1 of the door, a door or cloors bent or curved inward. in combination witl1 

